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Xanthan gum's not hard to find when you're checking labels. Candy, puddings, ice cream, even cottage cheese -- it's all over grocery store shelves. Although it’s not the easiest word to pronounce, xanthan gum is one additive that you can chew on without worry.

We hear nutrition advice all over the place -- from friends, family or even strangers (I've heard the strangest things in elevators). In this new series, we're taking on nutritional urban legends and giving you the real story. This week: does chewing gum really help you lose weight?